Machine for bending pipe.



No. 878,604; PATENTED FEB. 11, 1908.

L. H. BRINKMAN.

MACHINE FOR BENDING PIPE.

APPLICATION FILED JUNE 15.1904.

\ \/"L messes I Inuen c or 9 0.7" am. LouisP-l Bflnhmon. fiwwflw v y Km UNITED STATES PATENT OFFICE.

LOUIS H. BRINKMAN, OF WEST HARTFORD, CONNECTICUT, ASSIGNOR TO WHITLOCK COIL PIPE COMPANY, OF WEST HARTFORD, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

MACHINEFOR: BENDING 'PIPE..

Patented Feb. 1 1, 1908.

Application filed June 15.1904. Serial No. 212688.

To all whom it may concern:

Be it known thatI, LOUIS H. BRINICMAN, a citizen of the United States, residing at West Hartford, in the county of Hartford and State of Connecticut, have invented anew Similar reference letters and figures refer to similar parts in the different views.

My present invention consists in -an improvemen-t u on the ipe bending machine described in etters atent of the United States, No. 559,839, issued to me May 12, 1896, said machine comprising a pair of grooved bending rolls arranged to rotate in contact with the op osite sides of the pipe to be bent, one of said rolls having a clamping device adapted to seizethe pipe and cause it to thereby bending the pipe with a curvature corresponding to the periphery of the roll, and my present invention consists in applying to a machine of the class shown and described in said Letters Patent, No. 559 ,839 a block having a concave face which is held against the side of the pipe immediately back 0 the bending point, in order toreslst the bending strain applied to the pipe as the rolls are rotated. o

In the accompanying drawings I have shown in Fig. 1 a to view of a pipe bending machine substantial y' like that shown in the patent above-referred to, in which 1 denotes a rotating forming-roll having a peripheral roove 2, Fig. 4, adapted to'fit the pipe 3 to he bent." Carriedby'the forming-roll 1 is aclamping device 4 adapted to seize the pipe and cause it to be wound around the forming-roll 1 as the latter is rotated. Rotating in conjunction with the forming-roll 1 is a pressure-roll 5 having a corresponding peripheral groove 6 bearin against the opposite sides of the pipe. Tfie pipe 3 to be cut is placed u on a mandrel 7, connected together and to t e end of the mandrel-7 by articube wound upon the roll as it rotates,

lated joints, areballs 8 and 9 whose diameter, like that of the mandrel 7, substantially fills the interior of the pipe and revent the collapsin of the pipe as it is eing bent around t e forming-roll 1. All the above mentioned parts are, however, substantially like the corresponding parts embodied in the machine described in the patent to me above referred to, and forming no part of my present invention, which consists in inserting be-' tween the forming-roll 1 and the straight section 10 of the pipe 3, a supporting block 11 havin a concave face 12 adapted to bear a ainst the pipe, and prevent any wrinkling o the surface or other distortion of the pipe due to the bending strain as the formln roll 1 is rotated. The pipe supporting bloc 11 is carried upon one end of a rod 13, "said rod being supported at its opposite end bya fixed framework 14, Within which framework the rod 13 is adjustable by means of the nuts 15, 15, carried upon the screw threaded end 16 of the rod. The block 11 is provided with a curved side 17 adapted to fit the peripheral groove 2 of the formingroll and to fill the triangular space between the forming-roll 1 and the straight section 10 of the pipe 3, and the block 11 is firmly crowded into the space between the pipe and the forming-roll 1 by the adjustment of the nuts 15, 15 on the rod 13, in order to apply sufficient pressure to the pipe to hold 'it firml against the mandrel 7 and prevent any Wrin ling of the pi e inclosed between the mandrel 7 and the b ock 11 due to the bendin strain applied to the pipe as the formingro I1 is rotated. The mandrel 7 is supported upon a rod 18 adjustably held in the frame 14, so that the end 19 of the mandrel will be included within the direct line of pressure between the centers of the rolls 1- and 5, thereby maintaining the mandrel in a fixed position and enabling considerable pressure to be exerted by the block 11 agamst the straight section 10 of the pipe 3 and toward the mandrel 7, the compression against the pipe being s'ufiicient to prevent any wrinllng of the surface of the pipe back of the point of bending.

In the operation of bending, the inner side of *the pipe next the forming-roll is compressed, or upset, at'the point of bending, and the outer or diametrically op osite si e is stretched. I have found that t e pi e, as it.is bent, has a tend,ency to wri e or ice buckle on the inside of the curve before it reaches the bending oint and the upsetting strains in fact extend for some distance behind the point or bending. I resist this 5 tendency to wrinkle or buckle behind the point of bending by compressing a section of the pipe on the inside of the curve, behind the point of bending between the block 11 and the mandrel.

What I claim as my inyentionand desire to secure by Letters Patent is 1. In a pi e bending machine, the combination wlt a forming roll around which the pipe is bent, of a block having one angle an acute angle, with one of the sides of said block forming said acute angle in contact with the forming roll and the other side in contact with the pipe to be bent, and means for holdin said block in that position while 0 the pipe is eing bent.

2. In a pi e bending machine, the combination w1t a forming roll around which the pipe is bent, of means in contact with said forming roll for exerting ressure on the 5 pipe to be bent immediatey behind the ending point, and means for applying a bending strain to said pipe.

3. In a pi e bending machine, the combination wit a forming roll around which 0 the pipe is bent, of a block in contact with the forming roll and in contact with that side of the pipe which is compressed by the bendin stram, means for holding said block in sald contact with said forming roll and with said pipe, and means for applying a bending strain to the pipe.

i. In a i e bending machine, the combination w1t a forming roll around which the pipe is bent, of a block in contact with the forming roll and in contact with that side of the pipe to be bent compressed by the bendin strain, and means for adjusting said block in a line parallel with the pipe to be bent.

5. The combination with, a forming roll and a mandrel, of a su porting block arranged to bear against the pipe to be bent between said formin and behind the hen ing point of said pipe, thereby ressing that side of said pipe against the mandrel, of an adjusting rod carrying said block and means for adjusting said rod in the fixed framework, whereby said block may be pressed against said pipe.

Dated this thirteenth day of June, 1904.

LOUIS I-I. BRINKMAN.

Witnesses:

E. D. REDFIELD, E. H. TUCKER.

roll and said mandrel 

